Medal withdrawal
Surely DCIs are the authority for the the receipt and wear of medals. So whatever the signal said it should be followed up by a DCI. This would explain the situation as whether permission to receive and or wear has been rescinded. Normally further receipts may be curtailed but previous recipients continue to enjoy the rules as they were when permission was first granted. It normally takes a declaration of war against the issuing country for these medals to be rescinded in toto, an unlikely situation with the UN - the issuing authority.